A 28-year-old multigravida at 28 weeks gestation with a singleton pregnancy presents with vaginal bleeding and mild lower abdominal pain. Ultrasound confirms a low-lying placenta (placenta previa) with no signs of placental abruption. Fetal heart rate is reassuring. She then develops regular uterine contractions (6 per 10 minutes) and cervical examination shows 2 cm dilation. What is the most appropriate next step?

Explanation

## Clinical Scenario: Preterm Labor with Placenta Previa This patient has **preterm labor at 28 weeks complicated by placenta previa**—a high-risk combination requiring careful management balancing maternal hemorrhage risk against neonatal prematurity. ## Key Management Principles **Key Point:** In preterm labor with placenta previa: 1. **Avoid digital cervical examination** (risk of severe hemorrhage) 2. **Administer tocolytics + corticosteroids** (same as uncomplicated preterm labor) 3. **Transfer to tertiary center** (capability for emergency cesarean + neonatal resuscitation) 4. **Expectant management** (unless hemorrhage or fetal compromise occurs) ### Management Algorithm ```mermaid flowchart TD A[Preterm labor + Placenta previa at 28 weeks]:::outcome A --> B{Hemorrhage or fetal compromise?}:::decision B -->|Yes| C[Emergency cesarean delivery]:::urgent B -->|No| D[Tocolytics + Corticosteroids]:::action D --> E[Avoid digital cervical exam]:::action E --> F[Transfer to tertiary center]:::action F --> G[Expectant management with monitoring]:::action G --> H[Reassess at 34 weeks or if complications arise]:::decision ``` ## Why Tocolytics Are Safe Here **Clinical Pearl:** Tocolytics do **not increase hemorrhage risk** in placenta previa. They reduce uterine contractions, which paradoxically *decreases* placental separation and bleeding. Avoiding tocolytics would allow unchecked contractions and increase hemorrhage risk. ## Why NOT Immediate Cesarean Delivery? | Reason | Explanation | |---|---| | **Stable fetus** | FHR reassuring; no indication for urgent delivery | | **Stable mother** | Mild bleeding only; no active hemorrhage | | **Prematurity risk** | Cesarean at 28 weeks increases neonatal morbidity/mortality unless medically indicated | | **Expectant management** | Standard of care: delay delivery to allow steroid effect and fetal maturation | **Warning:** Cesarean delivery at 28 weeks for stable preterm labor (even with previa) is **overtreatment** and exposes the neonate to unnecessary prematurity complications. ## Why NOT Magnesium Sulfate Alone? Magnesium sulfate provides neuroprotection but **does not arrest labor**. Tocolytics (nifedipine) are required to delay delivery and allow steroid effect. ## Why NOT Fetal Fibronectin? fFN is irrelevant once preterm labor is diagnosed clinically (contractions + cervical change). Additionally, it cannot guide management in the presence of placenta previa—tocolytics and steroids are indicated regardless.